Exploring CPCTC in Geometry

The video tutorial introduces CPCTC, an abbreviation for 'Corresponding Parts of Congruent Triangles are Congruent'. It explains how CPCTC is used in geometric proofs to establish the congruence of corresponding parts of triangles once the triangles themselves are proven congruent. The tutorial includes examples demonstrating the application of CPCTC in solving problems, such as proving triangles congruent using angle-side-angle and side-angle-side methods, and determining properties of equilateral and isosceles triangles.

What does CPCTC stand for?

• Corresponding Parts of Congruent Triangles are Congruent

• Congruent Parts of Corresponding Triangles are Congruent

• Corresponding Parts of Congruent Triangles are Connected

• Congruent Parts of Corresponding Triangles are Connected

Tags

CCSS.HSG.SRT.B.5

In the first example, which property is used to prove that side AD is congruent to itself?

• Substitution Property

• Reflexive Property

• Transitive Property

• Symmetric Property

Tags

CCSS.HSG.SRT.B.5

Which method is used to prove that triangles ABD and DCA are congruent in the first example?

• Side-Side-Side

• Angle-Side-Angle

• Angle-Angle-Side

• Side-Angle-Side

Tags

CCSS.HSG.SRT.B.5

What is the definition of an equilateral triangle?

• A triangle with two sides congruent

• A triangle with one right angle

• A triangle with all sides congruent

• A triangle with all angles congruent

Tags

CCSS.4.G.A.2

In the second example, what happens when an angle is bisected?

• It creates two congruent angles

• It creates an isosceles triangle

• It creates two congruent sides

• It creates a right angle

Tags

CCSS.HSG.GPE.B.6

Which property is used to prove that side BM is congruent to itself in the second example?

• Substitution Property

• Reflexive Property

• Transitive Property

• Symmetric Property

Tags

CCSS.HSG.SRT.B.5

Which method is used to prove that triangles ABM and CBM are congruent in the second example?

• Angle-Angle-Side

• Side-Angle-Side

• Angle-Side-Angle

• Side-Side-Side

Tags

CCSS.HSG.SRT.B.5

To prove a triangle is isosceles, what must be shown?

• All angles are congruent

• Two sides are congruent

• All sides are congruent

• One angle is a right angle

Tags

CCSS.2.G.A.1

How does CPCTC help in proving that AM is congruent to MC in the second example?

• By showing that they form a right angle

• By showing that they are corresponding parts of congruent triangles

• By showing that they are both equal to another side

• By showing that they are both bisected

Tags

CCSS.HSG.SRT.B.5

What is the main benefit of proving triangles are congruent using CPCTC?

• It simplifies the proof process

• It proves all angles are equal

• It connects unrelated pieces of information

• It proves all sides are equal

Tags

CCSS.HSG.SRT.B.5